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| All Patents in class 307/57 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,885,566 | May 05, 1959 | R.H. Eisengrein, G.G. Hermanson, C.L. Sadler | Control means | ||
| 2,900,527 | Aug. 18, 1959 | E.W. Erikson | Generator control system | ||